What are the effects of Marine Spark Plugs calorific value selection on engine performance?

1. Balance between calorific value selection and engine heat dissipation capacity
Hot spark plugs:
Features: At the same operating temperature, hot spark plugs have relatively poor heat dissipation capacity, so their insulator temperature is higher.
Influence: Suitable for household or small marine engines that do not pursue power performance. Such engines usually do not require too high ignition energy, and hot spark plugs can reduce carbon deposits caused by excessive heat dissipation. However, if the calorific value is too high, it may cause the spark plug to overheat, causing pre-ignition and detonation, affecting the stability and life of the engine.
Cold spark plugs:
Features: Cold spark plugs have strong heat dissipation capacity and low insulator temperature.
Influence: Suitable for high-horsepower, high-speed engines. Such engines require higher ignition energy to ensure combustion efficiency, and cold spark plugs can meet this demand. However, for small-displacement or low-speed engines, cold spark plugs may cause excessive carbon deposits due to excessive heat dissipation, thereby affecting ignition performance.
2. Specific impact on engine performance
Ignition performance:
Improper selection of calorific value will directly affect the ignition performance of the spark plug. Too high calorific value may cause the spark plug to overheat and lose ignition ability; too low calorific value may reduce ignition efficiency due to excessive carbon deposits.
Fuel economy:
The appropriate calorific value selection helps optimize the combustion process and improve fuel economy. Overcooled or overheated spark plugs may lead to incomplete combustion, thereby increasing fuel consumption.
Engine life:
Improper selection of spark plug calorific value may also have a negative impact on engine life. For example, overheating may cause spark plug ablation or electrode melting; overcooling may damage other engine parts due to excessive carbon deposits.
3. Selection suggestions
Choose according to engine type: high-horsepower, high-speed engines are suitable for cold-type spark plugs; while small-displacement, low-speed engines are more suitable for hot-type spark plugs.
Consider the use environment: Marine engines are usually faced with complex and changeable marine environments, such as high temperature, high humidity, salt spray, etc. Therefore, when choosing a spark plug, its corrosion resistance and waterproof performance must also be considered.